/**
 * Parse the metadata that follows a code fence's language:
 *
 * ```ts title="vite.config.ts" showLineNumbers startLine=12
 *
 * mdsvex hands this string to the highlighter as its third argument, so no
 * extra plumbing is needed to read it. Unknown entries are ignored rather than
 * rejected, so a fence never fails a build over an unrecognised flag.
 */
export type FenceMeta = {
    /** Filename or caption shown above the block. */
    title?: string;
    /** Whether to number the lines. `undefined` means "use the global default". */
    lineNumbers?: boolean;
    /** First line's number, for a snippet lifted out of a larger file. */
    startLine?: number;
};
export declare function parseFenceMeta(meta?: string | null): FenceMeta;
/** Whether a fence opts into Twoslash: ```ts twoslash */
export declare function hasTwoslash(meta?: string | null): boolean;